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56 lines
2.0 KiB
CoffeeScript
56 lines
2.0 KiB
CoffeeScript
DOMElementPool = require '../src/dom-element-pool'
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describe "DOMElementPool", ->
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domElementPool = null
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beforeEach ->
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domElementPool = new DOMElementPool
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it "builds DOM nodes, recycling them when they are freed", ->
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[div, span1, span2, span3, span4, span5] = elements = [
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domElementPool.build("div")
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domElementPool.build("span")
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domElementPool.build("span")
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domElementPool.build("span")
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domElementPool.build("span")
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domElementPool.build("span")
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]
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div.appendChild(span1)
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span1.appendChild(span2)
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div.appendChild(span3)
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span3.appendChild(span4)
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domElementPool.freeElementAndDescendants(div)
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domElementPool.freeElementAndDescendants(span5)
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expect(elements).toContain(domElementPool.build("div"))
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expect(elements).toContain(domElementPool.build("span"))
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expect(elements).toContain(domElementPool.build("span"))
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expect(elements).toContain(domElementPool.build("span"))
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expect(elements).toContain(domElementPool.build("span"))
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expect(elements).toContain(domElementPool.build("span"))
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expect(elements).not.toContain(domElementPool.build("div"))
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expect(elements).not.toContain(domElementPool.build("span"))
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it "forgets free nodes after being cleared", ->
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span = domElementPool.build("span")
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div = domElementPool.build("div")
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domElementPool.freeElementAndDescendants(span)
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domElementPool.freeElementAndDescendants(div)
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domElementPool.clear()
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expect(domElementPool.build("span")).not.toBe(span)
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expect(domElementPool.build("div")).not.toBe(div)
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it "throws an error when trying to free the same node twice", ->
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div = domElementPool.build("div")
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domElementPool.freeElementAndDescendants(div)
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expect(-> domElementPool.freeElementAndDescendants(div)).toThrow()
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it "throws an error when trying to free an invalid element", ->
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expect(-> domElementPool.freeElementAndDescendants(null)).toThrow()
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expect(-> domElementPool.freeElementAndDescendants(undefined)).toThrow()
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